animals are plentiful. we worry about animals going extinct, endangered species. here's the puzzle. if you want to save an animal which encourage people to edith? you would think -- john: donated. >> but if you can make a profit from eating it, that creates the incentive, and if you can prioritize the ownership that creates an incentive to take care of it and grow. as a result there is plenty of turkey, but you chicken, and other animals are scarce because there is no incentive, unfortunately to take care of them. john: both humans and hot seat taken, but the more hawks the fewer chickens, the more seamen's the more chickens. >> that was an inside of henry george, early economist. he understood that this nature, more hawks, they eat the chickens. come deplete the population. if we get numerous more chickens . that is the power of incentives. john: breed chickens. make sure we have plety.